Nautilus Nitro Leg Extension

The Nautilus Nitro Leg Extension isolates the quadriceps through the full knee-extension range. Built on Nautilus's patented four-bar linkage cam — the original Nautilus invention from the 1970s — the resistance curve matches the natural strength curve of your quads, so the load feels heavier where you're stronger and lighter where you're weaker. Reclined seat back keeps your hips at the right angle so the work stays in the quads, not the hip flexors. Adjustable seat depth, padded ankle roller, and a thigh hold-down keep you locked in. The Nitro line is the version of Nautilus you'll find in commercial gyms — built to handle thousands of reps per week for 15+ years. 255 lb stack handles any user.